spark gap

WordReference Random House Unabridged Dictionary of American English © 2026

spark′ gap′, [Elect.]

1. Electricity a space between two electrodes, across which a discharge of electricity may take place.
2. Electricity the electrodes and the space between, considered as a unit: used in ignition systems.

• 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::

spark gap noun

1. the space between two electrodes across which a spark can jump